physics paper 2 sl markscheme物理学试卷评分.pdfVIP

ñ4ñN05/4/PHYSI/SP2/ENG/TZ0/XX/M+

SECTIONA

A1.(a)anyline(curve)throughtheorigins;

straight-line;[2]

(b)(i)astraight-line(drawnwithruler);

whichisappropriatei.e.doesnotorwouldnotgothroughtheorigin;[2]

Award[0]ifpointsjoinedìdottodotî.

(ii)datasubjectedtobothtypesoferror;

Canbeimpliedinsubsequentanswer.

randomsincepointsarescatteredaboveandbelowtheline;

systematicsincelinedoesnot/wouldnotgothroughorigin;[3]

Acceptanswersthatgetthisgeneralideaacrossbutdonotacceptanswersthat

trytoexplainthesourceoftheerrorwithoutnamingtypeoferror.

Award[2max]foranswersthatconfuserandomwithsystematicbutare

otherwisecorrect.Award[1max]forstatingthatthereisonlyonetypeof

errorwithcorrectexplanation.

(iii)useofìlargetriangleîforgradient(seenorimplied);

Hypotenuseoftriangleusedshouldbeatleasthalfthedistancweenthefirst

andthelastpointonthegraphi.e.5cm.

togetgradient=0.5910−6=5.910−7;[2]

Ignoreanyunits.Award[1max]for0.59withoutpoweroften.Acceptfrom

5.3to6.510−7.

Award[0]ifusingasingle